Cheapest source for Glock magazine springs?

[Bushman]

I have factory mags and KCI mags. The KCI mag I've been using for years no longer locks the slide back when I empty the magazine (not shooting, just emptying by hand and trying to lock the slide back). The factory mags still do lock back, so it can't be the slide lock lever spring.

I've heard that the springs are the weak point and that changing out the springs will bring them up to snuff. From what I've seen so far, $6-$7 is the going price, but I wonder if anyone here has seen a cheaper source?

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